Question

which gas is produced by cellular respiration?
oxygen
carbon dioxide
hydrogen
nitrogen

Explanation:

Cellular respiration is a process where cells break down glucose and oxygen to produce energy (ATP). One of the by - products of this process is carbon dioxide. Nitrogen is not a product of cellular respiration as it is not directly involved in the core reactions. Hydrogen is part of water (a product in some cases of cellular respiration but not in the form of hydrogen gas). Oxygen is a reactant in aerobic cellular respiration, not a product.

Answer:

Carbon dioxide